CN107276701B - Method and device for detecting sub-carrier power and radio remote unit - Google Patents
Method and device for detecting sub-carrier power and radio remote unit Download PDFInfo
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- CN107276701B CN107276701B CN201610209179.0A CN201610209179A CN107276701B CN 107276701 B CN107276701 B CN 107276701B CN 201610209179 A CN201610209179 A CN 201610209179A CN 107276701 B CN107276701 B CN 107276701B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/327—Received signal code power [RSCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
Abstract
The invention provides a method, a device and a radio remote unit for detecting the power of sub-carriers, wherein the method comprises the steps of receiving feedback data of each sub-carrier and calculating the power of the sub-carriers of each sub-carrier according to the feedback data; determining the sub-carriers needing gain adjustment from the sub-carriers according to the sub-carrier power of each sub-carrier and a set sub-carrier power threshold; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and a set sub-carrier power threshold; and performing gain adjustment on the sub-carrier needing gain adjustment according to the error compensation value, so that the error between the power of the sub-carrier after the gain adjustment and the set power threshold of the sub-carrier is in a preset range. By the method, the device and the radio remote unit, the problem of unevenness in a forward link band can be solved, and the calibrated total transmitting power and each sub-carrier power are more accurate.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for detecting subcarrier power, and a remote radio unit.
Background
In a wireless communication system, the forward transmission power determines the coverage of the forward direction, and the forward coverage is usually limited by both the forward coverage and the reverse coverage, for example: if the forward coverage is larger than the reverse coverage, the inconsistency of the forward coverage can be caused, the terminal can not access the wireless communication system under the condition of forward signals, and in the cellular communication system, if the forward coverage is too large, the required forward coverage is exceeded, the interference of adjacent cells can be reflected by the overlapping of the coverage of the adjacent cells. It can be seen that the transmit power is an important indicator to determine in a wireless communication system.
In addition, in a multi-carrier wireless communication system, the transmission power of each carrier needs to be consistent, and the coverage area of each carrier is guaranteed to be consistent, so that the power of each carrier needs to be calibrated when the forward transmission power is determined.
As shown in fig. 1, in a conventional method for detecting carrier transmission power in a multi-carrier wireless communication system, each carrier is processed by a forward transmitter, and sequentially includes a gain adjustment unit 101, 102 in a forward link, a baseband power detection unit 201, 202, a. 601 a total power detection means. A gain adjustment unit 101, 102, for adjusting the gain of the received baseband signal to adjust the power of the baseband signal; a baseband power detection unit 201, 202, for detecting the power of the baseband signal; the power detection unit 601 is used to detect the total transmission power of the base station. As shown in fig. 2, a conventional configuration of a multi-carrier power detection apparatus is provided with a control unit 701, which reads detection results of baseband power detection units 201 and 201, respectively, reads a result of total power detection performed by the power detection unit 601, calculates transmission power per carrier from the total base station transmission power and baseband signal power per carrier, compares the calculated carrier transmission power with a difference set by the carrier transmission power, and controls gain adjustment units 101 and 102 to perform gain adjustment.
Based on this, as shown in fig. 3, the conventional multicarrier power detection procedure is as follows:
1. calculating the transmitting power of each carrier according to the total power transmitted by the base station and the baseband signal power of each carrier;
2. traversing each carrier to judge whether the transmitting power of the carrier reaches the set value of the power of the carrier, if so, ending the process, otherwise, executing the step 3;
3. calculating the carrier gain of the carrier needing to be adjusted, and adjusting the gain of each carrier; then, returning to the step 1;
the existing detection method can theoretically achieve that the transmission power of each carrier can meet the requirement, but has a premise that the gain band of a forward link is flat, and the gains of the carriers are consistent. Due to the discreteness of hardware and radio frequency device parameters, gain flatness of a forward link is difficult to achieve, and particularly for a power amplification device, higher requirements are required to be provided for forward link design and device technology if the flatness in a band meets certain requirements, so that the design difficulty and equipment cost are increased.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, an apparatus and a radio remote unit for detecting sub-carrier power, which can overcome the problem of unevenness in the forward link band, and make the calibrated total transmitted power and each sub-carrier power more accurate.
In a first aspect, an embodiment of the present invention provides a method for detecting carrier power, where the method includes:
receiving feedback data of each subcarrier, and calculating subcarrier power of each subcarrier according to the feedback data;
determining the sub-carriers needing gain adjustment from the sub-carriers according to the sub-carrier power of each sub-carrier and a set sub-carrier power threshold; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and a set sub-carrier power threshold;
and performing gain adjustment on the sub-carrier needing gain adjustment according to the error compensation value, so that the error between the power of the sub-carrier after the gain adjustment and the set power threshold of the sub-carrier is in a preset range.
The receiving feedback data of each subcarrier and calculating the subcarrier power of each subcarrier according to the feedback data includes:
receiving feedback data of each sub-carrier fed back by a feedback link;
and converting the feedback data into a power spectrum, and performing power calculation according to the corresponding position of the sub-carrier frequency point information of each sub-carrier in the power spectrum to obtain the sub-carrier power of each sub-carrier.
The method for converting the feedback data into the power spectrum and calculating the power according to the corresponding position of the sub-carrier frequency point information of each sub-carrier in the power spectrum to obtain the sub-carrier power of each sub-carrier comprises the following steps:
calculating the power spectrum of each feedback data through a Fast Fourier Transform (FFT) algorithm and a spectrum power calculation method;
acquiring the position, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth of a numerically controlled oscillator NCO of each sub-carrier;
and calculating the sub-carrier power of each sub-carrier according to the position of the NCO of each sub-carrier, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth.
The receiving feedback data of each subcarrier and calculating the subcarrier power of each subcarrier according to the feedback data includes:
shifting each subcarrier to be calculated to 0 frequency by a frequency shift algorithm by using feedback data and NCO, feedback frequency shift frequency and feedback sampling rate of the subcarrier corresponding to the feedback data;
and (3) enabling the data after frequency shift to pass through a low-pass filter, calculating the time domain average power of the data after the low-pass filter, and compensating the gain of the filter to obtain the sub-carrier power of each sub-carrier, wherein the passband bandwidth of the low-pass filter is the bandwidth of one sub-carrier.
Wherein, carry out gain adjustment to the subcarrier that needs to carry out gain adjustment according to the compensation value of error for the error between subcarrier power after gain adjustment and the subcarrier power threshold value of settlement is in the scope of predetermineeing, includes:
and sending the error compensation value to a gain control module corresponding to the subcarrier needing gain adjustment so that the gain control module performs gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, and the error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is in a preset range.
In a second aspect, an embodiment of the present invention provides an apparatus for detecting subcarrier power, including:
the calculating module is used for receiving the feedback data of each subcarrier and calculating the subcarrier power of each subcarrier according to the feedback data;
the determining module is used for determining the sub-carriers needing gain adjustment from the sub-carriers according to the sub-carrier power of each sub-carrier and a set sub-carrier power threshold; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and a set sub-carrier power threshold;
and the adjusting module is used for performing gain adjustment on the sub-carrier needing to be subjected to gain adjustment according to the error compensation value, so that the error between the power of the sub-carrier after the gain adjustment and the set power threshold of the sub-carrier is within a preset range.
Wherein, the calculation module includes:
a receiving unit, configured to receive feedback data of each subcarrier fed back by a feedback link;
and the first calculating unit is used for converting the feedback data into a power spectrum, and performing power calculation according to the corresponding position of the sub-carrier frequency point information of each sub-carrier in the power spectrum to obtain the sub-carrier power of each sub-carrier.
Wherein the first calculation unit includes:
the first calculating subunit is used for calculating the power spectrum of each feedback data through a Fast Fourier Transform (FFT) algorithm and a frequency spectrum power calculating device;
the acquisition subunit is used for acquiring the position, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth of the NCO of the numerically controlled oscillator of each sub-carrier;
and the second calculating subunit is used for calculating the subcarrier power of each subcarrier according to the position of the NCO of each subcarrier, the feedback frequency shift frequency, the feedback sampling rate and the subcarrier bandwidth.
Wherein, the calculation module includes:
the second calculating unit is used for shifting each subcarrier to be calculated to 0 frequency by using feedback data and NCO, feedback frequency shift frequency and feedback sampling rate of the subcarrier corresponding to the feedback data through a frequency shift algorithm;
and the third calculating unit is used for enabling the data after frequency shift to pass through a low-pass filter, calculating the time domain average power of the data after the low-pass filter, compensating the gain of the filter, and obtaining the sub-carrier power of each sub-carrier, wherein the passband bandwidth of the low-pass filter is the bandwidth of one sub-carrier.
Wherein, the adjustment module includes:
and the adjusting unit is used for sending the error compensation value to a gain control module corresponding to the subcarrier needing gain adjustment so that the gain control module performs gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, and the error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is in a preset range.
In a third aspect, an embodiment of the present invention provides a remote radio unit, where the remote radio unit includes the apparatus for detecting the power of the sub-carrier.
The technical scheme of the invention at least comprises the following beneficial effects:
the method, the device and the radio remote unit for detecting the sub-carrier power multiplex the existing feedback link, realize the linkage of calculation and control in software, and do not need to arrange a total power measuring unit and a forward link baseband sub-carrier power measuring unit at an antenna feeder port, so that the overhead of system hardware does not need to be additionally increased, and the design cost of the system is reduced; and the pressure ratio to the link flatness is smaller, the total power and the sub-carrier power of the output signal can be truly reflected, the error of the acquired and calculated power is small, the measured and calculated power more truly reflects the real-time power of each sub-carrier of the antenna feeder, and the measured and calculated power more truly reflects the real-time power of each sub-carrier of the antenna feeder.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a block diagram illustrating a forward link structure of a base station of a conventional wireless communication system;
fig. 2 is a block diagram showing a conventional multi-carrier power detection apparatus;
fig. 3 shows a prior art multi-carrier power detection flow diagram;
fig. 4 is a flow chart of a method for detecting power of a sub-carrier according to an embodiment of the present invention;
fig. 5 is a block diagram illustrating an apparatus for subcarrier power detection according to an embodiment of the present invention;
FIG. 6 is a block diagram illustrating a forward link structure of a base station of a wireless communication system in accordance with an embodiment of the present invention;
fig. 7 is a flowchart illustrating a method for subcarrier power detection according to an embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
In a multi-carrier wireless communication base station system, a baseband signal is output according to configuration, a gain adjustment signal in a digital domain is subjected to digital-to-analog conversion, the signal is converted to an analog domain for up-conversion, and power amplification is carried out; then duplex filtering is carried out, and the antenna is emitted; for linearity requirements, the base station often adds a feedback link for DPD (Digital Pre-Distortion) design, and the feedback link performs analog-to-Digital conversion and Digital sampling.
The embodiment of the invention provides a method for detecting the power of the sub-carrier, which multiplexes a feedback link, acquires a digital signal passing through the feedback link at a power amplifier port in a digital domain, calculates the power of each sub-carrier according to the digital signal, compares the calculated power of the sub-carrier with a power threshold of the sub-carrier set by a forward baseband, and performs gain compensation on the power of the sub-carrier and the total power corresponding to a difference part, thereby achieving the purpose that the output of the power of the sub-carrier and the total power is consistent with a set value. Referring to fig. 4, a flowchart of a method for detecting power of a sub-carrier according to an embodiment of the present invention is shown. The method for detecting the power of the sub-carrier provided by the embodiment of the invention can comprise the following steps:
step S11, receiving feedback data of each sub-carrier, and calculating the sub-carrier power of each sub-carrier according to the feedback data;
step S12, according to the sub-carrier power of each sub-carrier and the set sub-carrier power threshold, determining the sub-carrier needing gain adjustment from each sub-carrier; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and a set sub-carrier power threshold;
and step S13, performing gain adjustment on the sub-carrier needing to be subjected to gain adjustment according to the error compensation value, so that the error between the power of the sub-carrier after gain adjustment and the set power threshold of the sub-carrier is within a preset range.
The sub-carrier power of each sub-carrier can be calculated by adopting a frequency domain detection method according to the feedback data. In this case, in step S11, the receiving feedback data of each subcarrier and calculating subcarrier power of each subcarrier according to the feedback data may include:
receiving feedback data of each sub-carrier fed back by a feedback link;
the feedback link is multiplexed and receives feedback data of each sub-carrier fed back by the feedback link, the feedback data reflects a real-time power signal of the antenna feeder, and the calculated power of each sub-carrier can more truly reflect the real-time power of each sub-carrier of the antenna feeder.
And converting the feedback data into a power spectrum, and performing power calculation according to the corresponding position of the sub-carrier frequency point information of each sub-carrier in the power spectrum to obtain the sub-carrier power of each sub-carrier.
Specifically, the converting the feedback data into a power spectrum, and performing power calculation according to the corresponding position of the subcarrier frequency point information of each subcarrier in the power spectrum to obtain the subcarrier power of each subcarrier may include:
the power spectrum of each feedback data is calculated by a Fast Fourier Transform (FFT) algorithm and a spectral power calculation method.
Here, the power spectrum of each feedback data can be calculated using the following principle formula:
assuming that the collected and received feedback data is x (n), the feedback data may be expressed as x (n) ═ xI(n)+j*xQ(n) wherein xI(n) represents a real part signal, j xQ(n) represents the imaginary signal;
performing FFT (fast Fourier transform) of N points on the feedback data to obtain a magnitude spectrum of the feedback data, wherein the magnitude spectrum is assumed to be X (k) and is shown as a formula 1-1:
calculating a power spectrum of the feedback data according to the amplitude spectrum X (k), assuming that the power spectrum is P (k), as shown in formula 1-2:
P(k)＝X(k)*X*(k) k is 0,1, …, N-1 formula 1-2
The position, feedback frequency shift frequency, feedback sampling rate and sub-carrier bandwidth of each sub-carrier NCO (Numerically Controlled Oscillator) are obtained.
Here, it is assumed that NCO of each subcarrier is NCOiThe feedback frequency shift frequency is MvFrq, the feedback sampling rate is SampFrq, the sub-carrier bandwidth is BW, and i represents the sub-carrier identifier.
And calculating the sub-carrier power of each sub-carrier according to the position of the NCO of each sub-carrier, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth.
Here, the subcarrier power of each subcarrier can be calculated by using the following principle formula:
firstly, after FFT conversion of N-point length is carried out on feedback data, the length of an obtained power spectrum is N points, the length is taken as FFT _ SIZE, and therefore a corresponding bandwidth Bwpoint corresponding to each point can be obtained, and the formula is shown in formulas 1 to 3:
then, according to the sub-carrier bandwidth BW of the sub-carrier, the length occupied by the sub-carrier in the power spectrum is calculated, and it is assumed here that the length occupied by the sub-carrier in the power spectrum is NiAs shown in formulas 1-4:
then, NCO according to the subcarrieriInformation obtaining sub-carrier central frequency point amplitudeThe position in the spectrum is assumed that the center frequency point of the sub-carrier is N0As shown in formulas 1-5:
then, a starting point is calculated from the power spectrum of the subcarrier, assuming NcoP (0), as shown in equations 1-6:
and finally, combining the formula to calculate the subcarrier power value of each subcarrier, and assuming that the corresponding point of the frequency point in the power spectrum is NcoPi(j) The value of the subcarrier power is CarrPowiAs shown in formulas 1-7:
in addition, the sub-carrier power of each sub-carrier can also be calculated by adopting a time domain detection method according to the feedback data. In this case, in step S11, the receiving feedback data of each subcarrier and calculating subcarrier power of each subcarrier according to the feedback data may include:
shifting each subcarrier to be calculated to 0 frequency by a frequency shift algorithm by using feedback data and NCO, feedback frequency shift frequency and feedback sampling rate of the subcarrier corresponding to the feedback data;
here, it is assumed that the collected and received feedback data is x (n), which may be expressed as x (n) ═ xI(n)+j*xQ(n) wherein xI(n) represents a real part signal, j xQ(n) represents the imaginary signal; assuming NCO of each subcarrier is NCOiAnd i represents a sub-carrier identifier, the feedback frequency shift frequency is MvFrq, and the feedback sampling rate is SampFrq. In the above step, the data after the subcarrier is shifted to 0 frequency can be obtained by using the following principle formula, as shown in formula 2-1:
and (3) enabling the data after frequency shift to pass through a low-pass filter, calculating the time domain average power of the data after the low-pass filter, and compensating the gain of the filter to obtain the sub-carrier power of each sub-carrier, wherein the passband bandwidth of the low-pass filter is the bandwidth of one sub-carrier.
Here, the subcarrier power of each subcarrier can be calculated by using the following principle formula:
suppose the data after frequency shift is xNCOi(n), the low-pass filter is h (n), and the data after the low-pass filter is yi(n), wherein the passband bandwidth of the low pass filter is the bandwidth of one subcarrier, and the calculation formula is shown in formula 2-2:
averaging the data after the low pass filter to obtain the sub-carrier power of each sub-carrier, and assuming that the power value of the sub-carrier is CarrPowiAs shown in formulas 2-3:
wherein, carry out gain adjustment to the subcarrier that needs to carry out gain adjustment according to the compensation value of error for the error between subcarrier power after gain adjustment and the subcarrier power threshold value of settlement is in the scope of predetermineeing, includes:
and sending the error compensation value to a gain control module corresponding to the subcarrier needing gain adjustment so that the gain control module performs gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, and the error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is in a preset range.
In the above embodiment, the method for detecting the sub-carrier power provided by the embodiment of the present invention multiplexes the existing feedback link, realizes the linkage of calculation and control through software, and does not need to provide a total power measurement unit and a forward link baseband sub-carrier power measurement unit at the antenna feed port, so that the overhead of system hardware does not need to be additionally increased, and the design cost of the system is reduced; and the data is returned through the antenna feeder port acquired by the feedback link, because the power of the feedback link is relatively low, the pressure ratio to the link flatness is relatively low, the total power and the sub-carrier power of the output signal can be truly reflected, the error of the acquired and calculated power is small, and the measured and calculated power more truly reflects the real-time power of each sub-carrier of the antenna feeder port.
Based on the above method, an embodiment of the present invention further provides a device for implementing the method, please refer to fig. 5, which shows a block diagram of a structure of the device for detecting subcarrier power according to the embodiment of the present invention. The apparatus for detecting power of a sub-carrier provided in the embodiments of the present invention may include: a calculation module 21, a determination module 22 and an adjustment module 23.
The calculating module 21 is configured to receive feedback data of each subcarrier, and calculate subcarrier power of each subcarrier according to the feedback data;
a determining module 22, configured to determine, according to the subcarrier power of each subcarrier and a set subcarrier power threshold, a subcarrier that needs to be gain-adjusted from each subcarrier; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and a set sub-carrier power threshold;
the adjusting module 23 is configured to perform gain adjustment on the subcarrier that needs to be subjected to gain adjustment according to the error compensation value, so that an error between the power of the gain-adjusted subcarrier and a set power threshold of the subcarrier is within a preset range.
Among them, the calculation module 21 may include: a receiving unit and a first calculating unit.
A receiving unit, configured to receive feedback data of each subcarrier fed back by a feedback link;
and the first calculating unit is used for converting the feedback data into a power spectrum, and performing power calculation according to the corresponding position of the sub-carrier frequency point information of each sub-carrier in the power spectrum to obtain the sub-carrier power of each sub-carrier.
Wherein the first calculation unit may include: the device comprises a first calculation subunit, an acquisition subunit and a second calculation subunit.
The first calculating subunit is used for calculating the power spectrum of each feedback data through a Fast Fourier Transform (FFT) algorithm and a frequency spectrum power calculating device;
the acquisition subunit is used for acquiring the position, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth of the NCO of the numerically controlled oscillator of each sub-carrier;
and the second calculating subunit is used for calculating the subcarrier power of each subcarrier according to the position of the NCO of each subcarrier, the feedback frequency shift frequency, the feedback sampling rate and the subcarrier bandwidth.
Furthermore, the calculation module 21 may also include: a second calculation unit and a third calculation unit.
The second calculating unit is used for shifting each subcarrier to be calculated to 0 frequency by using feedback data and NCO, feedback frequency shift frequency and feedback sampling rate of the subcarrier corresponding to the feedback data through a frequency shift algorithm;
and the third calculating unit is used for enabling the data after frequency shift to pass through a low-pass filter, calculating the time domain average power of the data after the low-pass filter, compensating the gain of the filter, and obtaining the sub-carrier power of each sub-carrier, wherein the passband bandwidth of the low-pass filter is the bandwidth of one sub-carrier.
Wherein, the adjusting module 23 may include: and an adjusting unit.
And the adjusting unit is used for sending the error compensation value to a gain control module corresponding to the subcarrier needing gain adjustment so that the gain control module performs gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, and the error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is in a preset range.
The apparatus for detecting the power of the sub-carrier provided in the foregoing embodiment and the method for detecting the power of the sub-carrier provided in the embodiment of the present invention belong to the same concept, and specific implementation processes thereof are described in detail in the method embodiment, and are not described herein again in order to avoid repetition.
In the above embodiment, the device for detecting the sub-carrier power provided by the embodiment of the present invention multiplexes the existing feedback link, realizes the linkage of calculation and control through software, and does not need to provide a total power measurement unit and a forward link baseband sub-carrier power measurement unit at the antenna feed port, so that the overhead of system hardware does not need to be additionally increased, and the design cost of the system is reduced; and the data is returned through the antenna feeder port acquired by the feedback link, because the power of the feedback link is relatively low, the pressure ratio to the link flatness is relatively low, the total power and the sub-carrier power of the output signal can be truly reflected, the error of the acquired and calculated power is small, and the measured and calculated power more truly reflects the real-time power of each sub-carrier of the antenna feeder port.
An embodiment of the present invention provides a remote radio unit, which includes the apparatus for detecting the subcarrier power.
Since any of the above-mentioned devices for detecting the power of the sub-carrier has the above-mentioned technical effects, the remote radio unit having the device for detecting the power of the sub-carrier should also have corresponding technical effects, and the specific implementation process thereof is similar to that in the above-mentioned embodiments, and will not be described again.
The invention is described in more detail below with reference to a specific embodiment.
Referring to fig. 6, which is a block diagram illustrating a forward link structure of a base station of a wireless communication system according to an embodiment of the present invention, fig. 6 is a diagram that reduces the baseband power detection units 201 and 202, the power detection unit 601 and the control unit 701, and adds a power calculation and control unit 801, compared to fig. 1. In the forward link of the base station of the wireless communication system according to the embodiment of the present invention, a feedback link and a gain control module are multiplexed, and a power calculation and control unit 801 is added in a digital domain, and the power calculation and control unit 801 is connected to the feedback link and the gain adjustment unit 101, 102. The power calculation and control unit is divided into three functional modules, namely a data sampling module, a data power calculation module and a gain control adjustment module, wherein the data sampling module and the data power calculation module have the functions of the calculation module 21 of the device for detecting the sub-carrier power in the embodiment of the invention; the gain control adjustment module includes the functions of the determination module 22 and the adjustment module 23 of the apparatus for subcarrier power detection in the embodiment of the present invention, and also includes the function of the gain control module in the prior art.
The data sampling module is connected with the feedback link and used for reading and acquiring feedback data in the feedback link; the data power calculation module is used for calculating the sub-carrier power of the feedback data acquired by the data sampling module by a frequency domain detection method or a time domain detection method; the gain control adjustment module is respectively connected with the gain adjustment units 101 and 102, the carrier power threshold configured for each sub-carrier, compares the sub-carrier power calculated by the data power calculation module with the corresponding sub-carrier power threshold, determines an error compensation value thereof, and increases the gain of the gain adjustment unit corresponding to the sub-carrier when the calculated sub-carrier power is smaller than the corresponding sub-carrier power threshold and the error between the two is not in a preset range, so that the error between the gain-adjusted sub-carrier power and the set sub-carrier power threshold is in the preset range; and when the calculated sub-carrier power is greater than the corresponding sub-carrier power threshold and the error between the calculated sub-carrier power and the corresponding sub-carrier power threshold is not within the preset range, reducing the gain of the gain adjusting unit corresponding to the sub-carrier so that the error between the gain-adjusted sub-carrier power and the set sub-carrier power threshold is within the preset range.
With reference to fig. 7, a flow of the method for detecting subcarrier power according to the embodiment of the present invention is as follows:
step S31, firstly, transmitting a baseband signal, and outputting the signal according to the configuration requirement;
step S32, setting NCO of each sub-carrier signal to a data power calculation module;
step S33, starting a sub-carrier power calculation and control unit;
step S34, the data acquisition module acquires feedback data;
step S35, calculating the transmitting power of the sub-carrier by using the collected feedback data;
step S36, traversing each sub-carrier, and comparing the calculated transmitting power with the set sub-carrier power threshold; and if the error between the transmitting power and the set sub-carrier power threshold is within the preset range, directly ending the judgment.
Step S37, determining an error compensation value if the interpretation difference value exceeds a preset range, and performing gain compensation according to the error compensation value; and after the compensation is completed, jumping to the step 4 to initiate feedback data acquisition. And 4, further judging whether the error between the sub-carrier power obtained by calculation after the completion of the compensation is confirmed and the set sub-carrier power threshold value is within a preset range or not.
For simplicity of explanation, the foregoing method embodiments are described as a series of acts or combinations, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts or acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
It is noted that, in the embodiments of the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method for subcarrier power detection, the method comprising:
receiving feedback data of each subcarrier, and calculating subcarrier power of each subcarrier according to the feedback data;
determining the sub-carriers needing gain adjustment from the sub-carriers according to the sub-carrier power of each sub-carrier and a set sub-carrier power threshold; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and the set sub-carrier power threshold;
performing gain adjustment on the sub-carrier needing gain adjustment according to the error compensation value, so that the error between the power of the sub-carrier after gain adjustment and the set power threshold of the sub-carrier is within a preset range,
the receiving feedback data of each subcarrier and calculating subcarrier power of each subcarrier according to the feedback data includes:
receiving feedback data of each sub-carrier fed back by a feedback link;
and converting the feedback data into a power spectrum, and performing power calculation according to the corresponding position of the sub-carrier frequency point information of each sub-carrier in the power spectrum to obtain the sub-carrier power of each sub-carrier.
2. The method of claim 1, wherein the converting the feedback data into a power spectrum and performing power calculation according to corresponding positions of the subcarrier frequency point information of each subcarrier in the power spectrum to obtain the subcarrier power of each subcarrier comprises:
calculating the power spectrum of each feedback data through a Fast Fourier Transform (FFT) algorithm and a spectrum power calculation method;
acquiring the position, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth of a numerically controlled oscillator NCO of each sub-carrier;
and calculating the sub-carrier power of each sub-carrier according to the position of the NCO of each sub-carrier, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth.
3. The method according to claim 1, wherein the performing gain adjustment on the subcarrier to be gain-adjusted according to the error compensation value so that an error between a gain-adjusted subcarrier power and the set subcarrier power threshold is within a preset range includes:
and sending the error compensation value to a gain control module corresponding to the subcarrier needing gain adjustment, so that the gain control module performs gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, and the error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is in a preset range.
4. A method for subcarrier power detection, the method comprising:
receiving feedback data of each subcarrier, and calculating subcarrier power of each subcarrier according to the feedback data;
determining the sub-carriers needing gain adjustment from the sub-carriers according to the sub-carrier power of each sub-carrier and a set sub-carrier power threshold; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and the set sub-carrier power threshold;
performing gain adjustment on the sub-carrier needing gain adjustment according to the error compensation value, so that the error between the power of the sub-carrier after gain adjustment and the set power threshold of the sub-carrier is within a preset range,
the receiving feedback data of each subcarrier and calculating subcarrier power of each subcarrier according to the feedback data includes:
shifting each sub-carrier to be calculated to 0 frequency by the feedback data and the NCO position, the feedback frequency shift frequency and the feedback sampling rate of the sub-carrier corresponding to the feedback data through a frequency shift algorithm;
and (3) enabling the data after frequency shift to pass through a low-pass filter, calculating the time domain average power of the data after passing through the low-pass filter, and compensating the gain of the filter to obtain the sub-carrier power of each sub-carrier, wherein the passband bandwidth of the low-pass filter is the bandwidth of one sub-carrier.
5. An apparatus for subcarrier power detection, the apparatus comprising:
the calculating module is used for receiving feedback data of each subcarrier and calculating subcarrier power of each subcarrier according to the feedback data;
a determining module, configured to determine, according to the subcarrier power of each subcarrier and a set subcarrier power threshold, a subcarrier that needs to be gain-adjusted from each subcarrier; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and the set sub-carrier power threshold;
an adjusting module, configured to perform gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, so that an error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is within a preset range,
the calculation module comprises:
a receiving unit, configured to receive feedback data of each subcarrier fed back by a feedback link;
and the first calculating unit is used for converting the feedback data into a power spectrum, and performing power calculation according to the corresponding position of the sub-carrier frequency point information of each sub-carrier in the power spectrum to obtain the sub-carrier power of each sub-carrier.
6. The apparatus of claim 5, wherein the first computing unit comprises:
the first calculating subunit is used for calculating a power spectrum of each feedback data through a Fast Fourier Transform (FFT) algorithm and a spectrum power calculating device;
the acquisition subunit is used for acquiring the position, the feedback frequency shift frequency, the feedback sampling rate and the sub-carrier bandwidth of the NCO of the numerically controlled oscillator of each sub-carrier;
and the second calculating subunit is used for calculating the subcarrier power of each subcarrier according to the position of the NCO of each subcarrier, the feedback frequency shift frequency, the feedback sampling rate and the subcarrier bandwidth.
7. The apparatus of claim 5, wherein the adjustment module comprises:
and the adjusting unit is used for sending the error compensation value to a gain control module corresponding to the subcarrier needing gain adjustment so that the gain control module performs gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, and the error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is in a preset range.
8. An apparatus for subcarrier power detection, the apparatus comprising:
the calculating module is used for receiving feedback data of each subcarrier and calculating subcarrier power of each subcarrier according to the feedback data;
a determining module, configured to determine, according to the subcarrier power of each subcarrier and a set subcarrier power threshold, a subcarrier that needs to be gain-adjusted from each subcarrier; determining an error compensation value of the sub-carrier needing gain adjustment according to the sub-carrier power of the sub-carrier needing gain adjustment and the set sub-carrier power threshold;
an adjusting module, configured to perform gain adjustment on the subcarrier needing gain adjustment according to the error compensation value, so that an error between the power of the subcarrier after gain adjustment and the set power threshold of the subcarrier is within a preset range,
the calculation module comprises:
the second calculation unit is used for shifting each subcarrier to be calculated to 0 frequency through a frequency shift algorithm by using the feedback data and the position, the feedback frequency shift frequency and the feedback sampling rate of the NCO of the subcarrier corresponding to the feedback data;
and the third calculating unit is used for enabling the data after frequency shift to pass through a low-pass filter, calculating the time domain average power of the data after passing through the low-pass filter, compensating the gain of the filter, and obtaining the sub-carrier power of each sub-carrier, wherein the passband bandwidth of the low-pass filter is the bandwidth of one sub-carrier.
9. A remote radio unit comprising means for sub-carrier power detection as claimed in any one of claims 5 to 8.
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| CN112838994B (en) * | 2019-11-22 | 2024-03-19 | 中兴通讯股份有限公司 | Link pre-equalization compensation method and device, storage medium and electronic device |
| CN113328763B (en) * | 2021-06-03 | 2022-10-25 | 联想(北京)有限公司 | Carrier power control method and device and radio remote unit |
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